HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science

DAILY REPORT       #4786

PERIOD COVERED: 5am February 5 - 5am February 6, 2009 (DOY

                           036/1000z-037/1000z)

OBSERVATIONS SCHEDULED

FGS 11942

Increasing the Accuracy of HST Astrometry with FGS1R

We propose to observe six exoplanetary system host stars and two

planetary nebulae central stars with FGS1r. All objects have been

previously observed under proposals GO-09233, -09969, -10989, and

-11210. These observations will significantly extend the time baseline,

permitting improvements in the determination of proper motion. This

systematic motion must be removed to get at the perturbation of

interest, either due to exoplanetary companions or the orbital motion of

the Earth (parallax). In most cases the perturbation orbits will also

improve. We improve either companion mass or PN parallax. For one

target, GJ 876, theoretical dynamical modelers have proposed an

inclination closer to 50 degrees, while FGS3 measurements indicated an

inclination closer to 84 degrees. These new data, once combined with our

older FGS3 data, will permit an independent remeasurement of the

inclination of the outermost companion, and a re-evaluation of widely

used dynamical algorithms.

S/C 4974

TRTTEST

The Transient Response Test is for the periodic performance monitoring

of the FGS 2R servo A mechanism.

WFPC2 11967

WFPC2 Imaging of the Lockman Hole

In order to understand galaxy evolution and constrain theoretical

models, we require both multiwavelength photometry (to robustly

determine physical parameters such as star formation rates and stellar

masses) and detailed morphological information. Galaxy morphology

encodes crucial information about galaxy formation history and the

physical processes that trigger star formation and AGN activity, and

high-resolution imaging for large samples of galaxies is currently only

obtainable with HST. The Lockman Hole has been the target of extensive

multi-wavelength observations from the X-ray to the radio, and will be

the target of the deepest wide-area blankfield thermal IR observations

with Herschel, but currently lacks comprehensive HST imaging. We propose

to obtain WFPC2 imaging of ~500 arcmin2 of the central region of the

Lockman Hole in F606W and F814W, to a depth of V606~26.8 and I814~26.

This imaging is crucial in order to characterize the sources detected at

other wavelengths.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary reports

of potential non-nominal performance that will be investigated.)

HSTARS: (None)

COMPLETED OPS REQUEST:

18400-0 - Transient Response Trending Test (TRTT) #21

COMPLETED OPS NOTES: (None)

                       SCHEDULED      SUCCESSFUL

FGS GSacq               05                  05                    

FGS REacq               04                  04                    

OBAD with Maneuver 22                  22               

SIGNIFICANT EVENTS:

The Transient Response Trending Test (TRTT) was successfully completed

this morning at 036/15:07